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spi: omap2-mcspi: add support for pm_runtime autosuspend 

Adds support for configuring the omap2-mcspi driver use autosuspend for
runtime power management. This can reduce the latency in starting an
spi transfer by not suspending the device immediately following
completion of a transfer. If another transfer then takes place before
the autosuspend timeout (2 secs), the call to resume the device can
return immediately saving some save/ restore cycles.

Acked-by: Govindraj.R <govindraj.raja@ti.com>
Signed-off-by: Shubhrajyoti D <shubhrajyoti@ti.com>
This commit is contained in:
Shubhrajyoti D 2012-03-26 17:04:22 +05:30 committed by Grant Likely
parent 1bd897f849
commit 27b5284cfb
1 changed files with 5 additions and 1 deletions
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6
drivers/spi/spi-omap2-mcspi.c
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@ -44,6 +44,7 @@
#include <plat/mcspi.h>
#define OMAP2_MCSPI_MAX_FREQ 48000000
#define SPI_AUTOSUSPEND_TIMEOUT 2000
#define OMAP2_MCSPI_REVISION 0x00
#define OMAP2_MCSPI_SYSSTATUS 0x14
@ -265,7 +266,8 @@ static void omap2_mcspi_restore_ctx(struct omap2_mcspi *mcspi)
}
static void omap2_mcspi_disable_clocks(struct omap2_mcspi *mcspi)
{
pm_runtime_put_sync(mcspi->dev);
pm_runtime_mark_last_busy(mcspi->dev);
pm_runtime_put_autosuspend(mcspi->dev);
}
static int omap2_mcspi_enable_clocks(struct omap2_mcspi *mcspi)
@ -1212,6 +1214,8 @@ static int __devinit omap2_mcspi_probe(struct platform_device *pdev)
if (status < 0)
goto dma_chnl_free;
pm_runtime_use_autosuspend(&pdev->dev);
pm_runtime_set_autosuspend_delay(&pdev->dev, SPI_AUTOSUSPEND_TIMEOUT);
pm_runtime_enable(&pdev->dev);
if (status || omap2_mcspi_master_setup(mcspi) < 0)